Table 2 Path coefficients between Pn and environmental factors of Liriope muscari grown under high (HI), medium (MI) and low (LI) incident PAR in two groups

HI-1

PAR X1

− 0.09

–

0.128

0.684

0.812

− 0.651

Tleaf X2

0.154

− 0.075

–

0.830

0.755

− 0.547

RH X3

− 0.888

0.069

− 0.144

–

− 0.075

0.783

Regression equation: Y = 7.617 + 0.001 * X1 + 0.049 * X2 − 0.131 * X3

MI-1

PAR X1

0.032

–

− 0.090

0.851

0.760

− 0.577

Tleaf X2

− 0.108

0.027

–

0.967

0.993

− 0.975

RH X3

− 1.035

− 0.026

0.101

–

0.075

1.066

Regression equation: Y = 9.317 + 0.001 * X1 − 0.032 * X2 − 0.157 * X3

LI-1

PAR X1

0.383

–

0.562

–

0.562

− 0.170

Tleaf X2

0.608

0.354

–

–

0.354

0.244

Regression equation: Y = − 1.519 + 0.017 * X1 + 0.152 * X2

HI-2

Tleaf X2

− 3.630

–

–

4.287

4.287

0.657

RH X3

− 4.326

–

3.597

–

3.597

− 0.729

Regression equation: Y = 48.844 − 1.044 * X2 − 0.682 * X3

MI-2

PAR X1

1.4

–

− 0.263

− 0.371

− 0.634

1.558

Tleaf X2

− 0.279

1.320

–

− 0.377

0.943

− 0.812

RH X3

0.384

− 1.354

0.274

–

− 1.080

− 1.019

Regression equation: Y = 0.262 + 0.07 * X1 − 0.094 * X2

LI-2

PAR X1

1.293

–

− 0.314

− 0.141

− 0.456

1.464

Tleaf X2

− 0.363

1.120

–

− 0.140

0.980

− 0.828

RH X3

0.147

− 1.243

0.346

–

− 0.897

− 0.783

Regression equation: Y = − 0.337 + 0.056 * X1 − 0.091 * X2 + 0.022 * X3